package org.zhxy.zhxy.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

/**
 * 项目名称: Springboot模板
 * 作者: zhaojs
 * 创建日期: 2024年09月06日
 * 文件说明: Redis实现全局唯一ID
 */
@Component
public class RedisUniqueId {

    private static final long BEGIN_TIMESTAMP = 1640995200L;

    private StringRedisTemplate stringRedisTemplate;

    public RedisUniqueId(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    public long nextId(String keyPrefix) {
        //1.生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowSecond - BEGIN_TIMESTAMP;

        //2.生成序列号
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        Long count = stringRedisTemplate.opsForValue().increment("incr:" + keyPrefix + ":" + date);

        //3.拼接返回
        return timestamp << 32 | count;
    }

}






















